SpatialLines-class: a class for spatial lines
In sp: Classes and Methods for Spatial Data

SpatialLines-class

R Documentation

a class for spatial lines

Description

a class that holds spatial lines

Objects from the Class

hold a list of Lines objects; each Lines object holds a list of Line (line) objects.

Slots

lines:: Object of class "list"; list members are all of class Lines-class
bbox:: Object of class "matrix"; see Spatial-class
proj4string:: Object of class "CRS"; see CRS-class

Extends

Class "Spatial", directly.

Methods

[: signature(obj = "SpatialLines"): select subset of (sets of) lines; NAs are not permitted in the row index
coordinates: value is a list of lists with matrices
plot: signature(x = "SpatialLines", y = "missing"): plot lines in SpatialLines object
lines: signature(x = "SpatialLines"): add lines in SpatialLines object to a plot
rbind: signature(object = "SpatialLines"): rbind-like method, see notes
summary: signature(object = "SpatialLines"): summarize object

plot method arguments

The plot method for “SpatialLines” objects takes the following arguments:

x: object of class SpatialLines
xlim: default NULL; the x limits (x1, x2) of the plot
ylim: default NULL; the y limits of the plot
col: default 1; default plotting color
lwd: default 1; line width
lty: default 1; line type
add: default FALSE; add to existing plot
axes: default FALSE; a logical value indicating whether both axes should be drawn
lend: default 0; line end style
ljoin: default 0; line join style
lmitre: default 10; line mitre limit
...: passed through
setParUsrBB: set the par “usr” bounding box, see note in Spatial-class

Note

rbind calls the function SpatialLines, where it is checked that all IDs are unique. If rbind-ing SpatialLines without unique IDs, it is possible to set the argument makeUniqueIDs = TRUE, although it is preferred to change these explicitly with spChFIDs.

Author(s)

Roger Bivand, Edzer Pebesma

Examples

 
# from the sp vignette:
l1 = cbind(c(1,2,3),c(3,2,2))
rownames(l1) = letters[1:3]
l1a = cbind(l1[,1]+.05,l1[,2]+.05)
rownames(l1a) = letters[1:3]
l2 = cbind(c(1,2,3),c(1,1.5,1))
rownames(l2) = letters[1:3]
Sl1 = Line(l1)
Sl1a = Line(l1a)
Sl2 = Line(l2)
S1 = Lines(list(Sl1, Sl1a), ID="a")
S2 = Lines(list(Sl2), ID="b")
Sl = SpatialLines(list(S1,S2))
summary(Sl)
plot(Sl, col = c("red", "blue"))

sp documentation built on May 29, 2024, 5:33 a.m.